[655] - Boundedness of Turbulent Temperature Probability Distributions, and their Relation to the Vertical Profile in the Convective Boundary Layer

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Graf, A., Schüttemeyer, D., Geiß, H., Knaps, A., Möllmann-Coers, M., Schween, J., Kollet, S., Neininger, B., Herbst, M., Vereecken, H., 2010. Boundedness of Turbulent Temperature Probability Distributions, and their Relation to the Vertical Profile in the Convective Boundary Layer. Boundary-Layer Meteorology, 134, 459 - 486. DOI: 10.1007/s10546-009-9444-9.
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Title(s):Main Title: Boundedness of Turbulent Temperature Probability Distributions, and their Relation to the Vertical Profile in the Convective Boundary Layer
Description(s):Abstract: Higher-order moments, minima and maxima of turbulent temperature and water vapour mixing ratio probability density functions measured with an eddy-covariance system near the ground were related to each other and to vertical boundary-layer profiles of the same scalars obtained through airborne soundings. The dependence of kurtosis on squared skewness showed a kurtosis intercept below the Gaussian expectation, suggesting a compression of the probability density function by the presence of natural boundaries. This hypothesiswas corroborated by comparing actual minima and maxima of turbulent fluctuations to estimates obtained from the first four sample moments by fitting a four-parameter beta distribution. The most sharply defined boundaries were found for the minima of temperature datasets during the day, indicating that negative temperature fluctuations at the sensor are limited by the availability of lower temperatures in the boundary layer. By comparison to vertical profiles, it could be verified that the turbulent minimum of temperature near the ground is close to the minimum of potential temperature in the boundary layer. The turbulent minimum of water vapour mixing ratio was found to be equal to the mixing ratio at a height above the minimum of the temperature profile. This height roughly agrees with the top of the non-local unstable domain according to bulk Richardson number profiles. We conclude that turbulence statistics measured near the surface cannot be solely explained by local effects, but contain information about the whole boundary layer including the entrainment zone.
Identifier(s):DOI: 10.1007/s10546-009-9444-9
Responsible Party
Creator(s):Author: Alexander Graf
Author: Dirk Schüttemeyer
Author: Heiner Geiß
Author: Axel Knaps
Author: Michael Möllmann-Coers
Author: Jan Schween
Author: Stefan Kollet
Author: Bruno Neininger
Author: Michael Herbst
Author: Harry Vereecken
TR32 Topic:Other
Subject(s):CRC/TR32 Keywords: EC, Higher Order Moments, Kurtosis, Probability Density Function, Skewness, Turbulence
File Details
File Name:2010_Graf_BLM.pdf
Data Type:Text
Size(s):28 Pages
File Size:1328 kB (1.297 MB)
Date(s):Date Accepted: 2009-11-02
Issued: 2009-12-05
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Measurement Region:Ellebach
Measurement Location:Jülich (research centre)
Specific Informations - Publication
Article Type:Journal
Source:Boundary-Layer Meteorology
Number Of Pages:28
Page Range:459 - 486
Metadata Details
Metadata Creator:Alexander Graf
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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